arch/powerpc/include/asm/pte-common.h

   1 /* Included from asm/pgtable-*.h only ! */
   2
   3 /*
   4  * Some bits are only used on some cpu families... Make sure that all
   5  * the undefined gets a sensible default
   6  */
   7 #ifndef _PAGE_HASHPTE
   8 #define _PAGE_HASHPTE   0
   9 #endif
  10 #ifndef _PAGE_SHARED
  11 #define _PAGE_SHARED    0
  12 #endif
  13 #ifndef _PAGE_HWWRITE
  14 #define _PAGE_HWWRITE   0
  15 #endif
  16 #ifndef _PAGE_EXEC
  17 #define _PAGE_EXEC      0
  18 #endif
  19 #ifndef _PAGE_ENDIAN
  20 #define _PAGE_ENDIAN    0
  21 #endif
  22 #ifndef _PAGE_COHERENT
  23 #define _PAGE_COHERENT  0
  24 #endif
  25 #ifndef _PAGE_WRITETHRU
  26 #define _PAGE_WRITETHRU 0
  27 #endif
  28 #ifndef _PAGE_4K_PFN
  29 #define _PAGE_4K_PFN            0
  30 #endif
  31 #ifndef _PAGE_SAO
  32 #define _PAGE_SAO       0
  33 #endif
  34 #ifndef _PAGE_PSIZE
  35 #define _PAGE_PSIZE             0
  36 #endif
  37 /* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
  38 #ifndef _PAGE_RO
  39 #define _PAGE_RO 0
  40 #else
  41 #define _PAGE_RW 0
  42 #endif
  43 #ifndef _PMD_PRESENT_MASK
  44 #define _PMD_PRESENT_MASK       _PMD_PRESENT
  45 #endif
  46 #ifndef _PMD_SIZE
  47 #define _PMD_SIZE       0
  48 #define PMD_PAGE_SIZE(pmd)      bad_call_to_PMD_PAGE_SIZE()
  49 #endif
  50 #ifndef _PAGE_KERNEL_RO
  51 #define _PAGE_KERNEL_RO         (_PAGE_RO)
  52 #endif
  53 #ifndef _PAGE_KERNEL_ROX
  54 #define _PAGE_KERNEL_ROX        (_PAGE_EXEC | _PAGE_RO)
  55 #endif
  56 #ifndef _PAGE_KERNEL_RW
  57 #define _PAGE_KERNEL_RW         (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
  58 #endif
  59 #ifndef _PAGE_KERNEL_RWX
  60 #define _PAGE_KERNEL_RWX        (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC)
  61 #endif
  62 #ifndef _PAGE_HPTEFLAGS
  63 #define _PAGE_HPTEFLAGS _PAGE_HASHPTE
  64 #endif
  65 #ifndef _PTE_NONE_MASK
  66 #define _PTE_NONE_MASK  _PAGE_HPTEFLAGS
  67 #endif
  68
  69 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
  70  * kernel without large page PMD support
  71  */
  72 #ifndef __ASSEMBLY__
  73 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
  74 #endif /* __ASSEMBLY__ */
  75
  76 /* Location of the PFN in the PTE. Most 32-bit platforms use the same
  77  * as _PAGE_SHIFT here (ie, naturally aligned).
  78  * Platform who don't just pre-define the value so we don't override it here
  79  */
  80 #ifndef PTE_RPN_SHIFT
  81 #define PTE_RPN_SHIFT   (PAGE_SHIFT)
  82 #endif
  83
  84 /* The mask convered by the RPN must be a ULL on 32-bit platforms with
  85  * 64-bit PTEs
  86  */
  87 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
  88 #define PTE_RPN_MASK    (~((1ULL<<PTE_RPN_SHIFT)-1))
  89 #else
  90 #define PTE_RPN_MASK    (~((1UL<<PTE_RPN_SHIFT)-1))
  91 #endif
  92
  93 /* _PAGE_CHG_MASK masks of bits that are to be preserved across
  94  * pgprot changes
  95  */
  96 #define _PAGE_CHG_MASK  (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
  97                          _PAGE_ACCESSED | _PAGE_SPECIAL)
  98
  99 /* Mask of bits returned by pte_pgprot() */
 100 #define PAGE_PROT_BITS  (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
 101                          _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
 102                          _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
 103                          _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
 104
 105 /*
 106  * We define 2 sets of base prot bits, one for basic pages (ie,
 107  * cacheable kernel and user pages) and one for non cacheable
 108  * pages. We always set _PAGE_COHERENT when SMP is enabled or
 109  * the processor might need it for DMA coherency.
 110  */
 111 #define _PAGE_BASE_NC   (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
 112 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
 113         defined(CONFIG_PPC_E500MC)
 114 #define _PAGE_BASE      (_PAGE_BASE_NC | _PAGE_COHERENT)
 115 #else
 116 #define _PAGE_BASE      (_PAGE_BASE_NC)
 117 #endif
 118
 119 /* Permission masks used to generate the __P and __S table,
 120  *
 121  * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
 122  *
 123  * Write permissions imply read permissions for now (we could make write-only
 124  * pages on BookE but we don't bother for now). Execute permission control is
 125  * possible on platforms that define _PAGE_EXEC
 126  *
 127  * Note due to the way vm flags are laid out, the bits are XWR
 128  */
 129 #define PAGE_NONE       __pgprot(_PAGE_BASE)
 130 #define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
 131 #define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
 132                                  _PAGE_EXEC)
 133 #define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
 134 #define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
 135                                  _PAGE_EXEC)
 136 #define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
 137 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
 138                                  _PAGE_EXEC)
 139
 140 #define __P000  PAGE_NONE
 141 #define __P001  PAGE_READONLY
 142 #define __P010  PAGE_COPY
 143 #define __P011  PAGE_COPY
 144 #define __P100  PAGE_READONLY_X
 145 #define __P101  PAGE_READONLY_X
 146 #define __P110  PAGE_COPY_X
 147 #define __P111  PAGE_COPY_X
 148
 149 #define __S000  PAGE_NONE
 150 #define __S001  PAGE_READONLY
 151 #define __S010  PAGE_SHARED
 152 #define __S011  PAGE_SHARED
 153 #define __S100  PAGE_READONLY_X
 154 #define __S101  PAGE_READONLY_X
 155 #define __S110  PAGE_SHARED_X
 156 #define __S111  PAGE_SHARED_X
 157
 158 /* Permission masks used for kernel mappings */
 159 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
 160 #define PAGE_KERNEL_NC  __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 161                                  _PAGE_NO_CACHE)
 162 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 163                                  _PAGE_NO_CACHE | _PAGE_GUARDED)
 164 #define PAGE_KERNEL_X   __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
 165 #define PAGE_KERNEL_RO  __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
 166 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
 167
 168 /* Protection used for kernel text. We want the debuggers to be able to
 169  * set breakpoints anywhere, so don't write protect the kernel text
 170  * on platforms where such control is possible.
 171  */
 172 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
 173         defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
 174 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_X
 175 #else
 176 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_ROX
 177 #endif
 178
 179 /* Make modules code happy. We don't set RO yet */
 180 #define PAGE_KERNEL_EXEC        PAGE_KERNEL_X
 181
 182 /*
 183  * Don't just check for any non zero bits in __PAGE_USER, since for book3e
 184  * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
 185  * _PAGE_USER.  Need to explicitly match _PAGE_BAP_UR bit in that case too.
 186  */
 187 #define pte_user(val)           ((val & _PAGE_USER) == _PAGE_USER)
 188
 189 /* Advertise special mapping type for AGP */
 190 #define PAGE_AGP                (PAGE_KERNEL_NC)
 191 #define HAVE_PAGE_AGP
 192
 193 /* Advertise support for _PAGE_SPECIAL */
 194 #define __HAVE_ARCH_PTE_SPECIAL
 195